Tube holder



FIG. 1 is a perspective view of a tube holder, showing the new design;

FIG. 2 is a front elevational view of a base portion thereof, the rear elevational view being a mirror image thereof;

FIG. 3 is a left-side elevational view of the base portion thereof, the right-side elevational view being a mirror image thereof;

FIG. 4 is a top plan view thereof of the base portion;

FIG. 5 is a bottom plan view of the base portion thereof;

FIG. 6 is a front elevational view of a top portion thereof, the rear elevational view being a mirror image thereof;

FIG. 7 is a left-side elevational view of the top portion thereof, the right-side elevational view being a mirror image thereof;

FIG. 8 is a top plan view thereof of the top portion; and,

FIG. 9 is a bottom plan view of the top portion thereof.

The broken lines in the drawings represent unclaimed environmental subject matter. The break lines indicate that the tube holder is of non-specific length and may be formed of any even number of tubes. 

What is claimed is the ornamental design for a tube holder, as shown and described. 